Khloe has kicked Lamar out before, but we’re told this time she’s vowing not to fold … and Friday’s DUI bust was the last straw. Our sources say Lamar didn’t call Khloe or his lawyers after the arrest. They found out when TMZ broke the story hours later. Khloe was pissed.

Khloe and Lamar did spend time together Saturday at their home — but Lamar was sent on his merry way after 4 hours of jawboning about his addiction to crack and other drugs.

Sources say Lamar, who was arrested for a DUI last week, is refusing to go back to rehab.

“The addiction had taken over their marriage,” US Weekly reports. “The problem is cocaine. He would be high for three or four days at a time.”

The youngest Kardashian sister has been trying to stay positive in the midst of Lamar’s addiction. “Smile and no one will notice,” she recently tweeted.